Year US Dollars adjusted for inflation) 1960 113000000 1961 27000000 1962 181000000 1963 227000000 1964 418000000 1965 518000000 1966 401000000 1967 442000000 1968 591000000 1969 399000000 1970 561000000 1971 474000000 1972 501000000 1973 539000000 1974 683000000 1975 646000000 1976 295000000 1977 349000000 1978 298000000 1979 643000000 1980 523000000 1981 475000000 1982 445000000 1983 284000000 1984 240000000 1985 330000000 1986 455000000 1987 214000000 1988 192000000 1989 275000000 1990 606000000 1991 63000000 1992 185000000 1993 14000000 1994 29000000 1995 2000000 1996 39000000 1997 61000000 1998 170000000 1999 142000000 2000 21000000 2001 24000000 2002 21000000 2003 17000000 2004 285000000 2005 436000000 2006 60000000 2007 97000000 2008 76000000 2009 56000000 2010 107000000 2011 80000000 2012 21000000 2013 20000000 2014 0 2015 22000000 2016 177000000 2017 88000000 2018 35000000 2019 13000000 2020 189000000 2021 183000000 2022 126000000